Fluid-pressure brake device.



W. V, TURNER.

FLUID PRESSURE BRAKE DEVICE. APPLlCATlON FILED MAY 4. ma.

1 99,270. Patented Apr. 1, 1919.

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i citizen I of the $l United g :States, -residing at "Wilkinsburg, min i ithe CQllllllYjJi-Dfii A egh y a vThis inventionrelates to; fluid. I'Pi't brakes, and moreiipartlcularlyw'to aizbjrake q equipmentiii-which abrakepipe ventvalve and State of Pennsylvania, have invented a "new 1' and usefuli -Improvements 1 in- ;fFlu1d- 1 i PressurewBrake,.iDevices, of 1 which; I the fol- 1 lowing is a specification. 1"

7 device: is employed: for; effectingl a quickqlocalz reduction in brake ,:p1pe pressure .1

, :i Where a brakeipipeiventelvalve device ism employedii of the type having awpistoni sub-H ject to the opposing pressuresj of the, brake;

: pipe .and a chamber: adapted Ito be! charged H .g from. the brakeupipe, there ismai'udifliculty,E particularly if thervent .valverdevice; is .close L: to, the operating, brakevalve, that when} fluid underrpressure is rapidly supplied to? the brakejpipezin releasing the.brakes,;'as ind the full a release position of the brake iv y i the "chamber ot the vent: valve device is ;lia-

.ble topbe over-yeharged withzfiuid under,

pressure; so that upon movement 1 1 of the. brake, 'valve 'to running; pos1t1on,; the reduc: l i

fitionzina-lpressure in thei brake pipe, ,due tow,

equalization of i a fluid :pressure; throughout, 1 the brake pipe, is aptslto create a suffic1entr diiferential pressure with i respect to the-F .chamber of the "vent :valve device, so. as to:

i cause an: undesired emergency: actionof, the

ventvalvedevicell n 1; 1

According to m prior applic'atlon Seabove difficulty lSi obviated by providing a valve device"fonautomatically-equaliz1ng, i the fluidpressure in the:chamberlof the, vent valvevdevice :withtheybrake pipe pressure,

in casethe chamber becomes-overcharged in releasingfthe brake, While;notc;interfering1 1 with the 1desired:zemergencyiaction,iwhen a Insome:cases,iiniorder-to make itpossible i to initiate {an emergency iapplieationhof the brakes from anyclocomotiveain double or,

multiple heading,.the,uisual cut-out cock in the brake pipe connection tothe brake valve 1 i w is omitted: ,(and tinsteachii a cut-.out cock is i lg'lhe principal object of the present inveneB KE #Ev a 1. r e s a e t, Patented Apr, 1, i919. ucauonmea m e'ieiex Serial no. 232,440. i

, 11 i placed 111 the main reservoir connectlonv to the brakefi valve. a it a J -sWheregthis arrangement is employed in connection Witha vent valve device and the cut-,ofii ,valve device of the above mentioned prior patent application, if an emergency reduction in; brakeg pipe pressure is initiated nonl one locomotive in multiple heading, the

vent valve devices on the other locomotives are so remote from the operating locomotive that othe s-rate of reduction in brake pipe pres'suremay-not be rapid enough to insure the movement of the cut ofl valve so as to cut off connection from the vent valve chamber to the-brake pipe. The pressure in the chamber will 5 then bleed down through the cut-01f valve to the brake pipe and thus prevent the emergency action of the vent valve device tion v isqto provide meansifor obviating the aboveidiflicultyv ,1 y

wI nthe accompanying drawing, the single figure is a diagrammatic View, partly in section, of a locomotive brake equipment,

'fWlth my invention applied thereto.

As shown inthe drawing, the apparatus ma-ycomprisetan engineers brake valve 1 connected to the usual brake pipe 2 and having a. pipe 3,, connected to main reservoir-4, andcontaining a cutout cock 5.

mlA VBl'lt valve device 6 is interposedin the brakepipe 2tand a cut-off valve device 7 itcontrols the venting of fluid from the cham- 19 connected through passageslO, 11, and 12 with the brake pipe 2 and containing a piston 13gand a valve chamber 14 connected by passage 15,;to chamber 8 and containing a valve 16 adapted to be operated by piston 13.

A valve l'? is provided for venting fluid from the brake pipe and said valve is adapted to be operated by a piston 18, the operationof which is controlled by varying the pressure in piston chamber 19, through the action of valve 16.

The cut-ofi' valve device 7 comprlses a casing containing a double check valve 20, having one side connected by pipe 2l to chamber 8 and the opposite side to a p pe 22 which is adapted to Communicate With the brake pipe 2.

According to my present invention, there is interposed in the pipe 22, a valve devlce 23 comprising a casing, having a piston chamber 24, connected by pipe 25 t o the main reservoir pipe 3, and containing a piston 26. Said piston is adapted to operate a valve 27 which controls communication through the pipe 22 to the brake pipe 2. In operation, the valve chamber 14 and chamber 8 are normally charged with fluid pressure from the brake pipe through piston chamber 9 and passages 28 and 15, so that fluid pressures on opposite sides of the piston 13 are normally equalized and said piston remains in its release position, as shown in the drawing.

If the locomotive is the operative locomotive, the cut-out cock 5 is turned to its open position, in which the main reservoir 4 is connected to the brake valve device 1 and fluid from the main reservoir pipe 3 will then be supplied through pipe 25 to piston chamber 24. The piston 26 is consequently shifted so as to maintain the valve 27 in open position, establishing communication through pipe 22, from the cut-ofl valve device 7, to the brake pipe 2.

With the pipe 22 open to the brake pipe, if the chamber 8 should become overcharged with fluid under pressure in releasing the brakes, as the brake pipe pressure gradually falls below this pressure, the double check valve 20 will be operated by the higher pressure in chamber 8, so as to engage the spring stop 29 and open a bypass 30 around said valve, so that the excess pressure in chamber 8 is vented to the brake pipe and unintended action of the vent valve device is prevented.

If a sudden reduction in brake pipe pressure is made to effect an emergency application of the brakes, the rate of reduction in brake pipe pressure being greater than the rate at which the pressure in chamber 8 can reduce through the by-pass passage 30, the double check valve 20 will be shifted to its outer seat, cutting off communication through the passage 30. Since fluid cannot pipe is not interbe cut off from the piston 26, said piston will be operated by brake pipe pressure on the opposite side so as to permit the valve 27 to close.

The brake pipe being thus cut off from the double check valve 20, the same will be out out of operation on the non-operating locomotives, so that the slower rate of reduction in brake pipe pressure in an emergency application due to the locomotive being remote from the operating brake valve cannot be efi'ective to cause the possible movement of the cut-off valve device to its position for opening the bypass 30,'which would tend to prevent the emergency action of the vent valve device 6, by permitting the equalization of pressure in chamber 8 into the brake pi e.

aving now described my invention, what I claim as new, and desire to secure by Let ters Patent, is:

1. In a fluid pressure brake, the combination with a valve device subject to the op-' posing pressures of the brake pipe and a chamber, and valve means operated according to the pressure in said chamber for venting fluid from said chamber,'of means said valve means to the brake pipe.

3. In a fluid pressure brake, the combination with a brake pipe, a brake valve, a

main reservoir adapted to be connected to the brake valve, a valve device subject to the opposing pressures of the brake pipe and a chamber for venting fluid from the brake pipe, andvalve means for venting fluid from said chamber to the brake pipe, of means controlled by mam reservoir pressure for cutting said valve means out of action.

tion with a brake pipe, a brake valve, a main reservoir adapted to be connected to. the. brake valve, a valve device subject-to the opposing pressures of the brake pipe and a chamber for venting fluid from the brake pipe, and valve means for venting fluid from said chamber to the brake pipe, of means operated upon cutting oil the main reservoir connection to the brake valve for cutting off communication from said valve means to the brake pipe.

5. In a fluid pressure brake, the combination with a brake pipe, a brake valve, a main reservoir adapted to be connected to the 1 F 4. In a fluid pressure brake, the combinabrakevalve, a valve device subject to the fluid from the main reservoirto the brake opposmg pressures of the brake pipe and a Q valve for closln communication from said chamber for venting fluid from the brake valve means to t e brake ipe.

pipe, and valve means for venting fluid from In testimony whereof I ave hereunto set 5 said chamber to the brake pipe, of means my hand.

normally subject to main reservoir pressure and operated upon cutting off the supply of WALTER V. TURNER. 

